Add back in compiler, crosstool_top, cpu options

Author: jfirebaugh

bazel/emscripten_toolchain/wasm_cc_binary.bzl

@@ -26,6 +26,9 @@ def _wasm_transition_impl(settings, attr):
         features.append("wasm_simd")
 
     return {
+        "//command_line_option:compiler": "emscripten",
+        "//command_line_option:crosstool_top": "@emsdk//emscripten_toolchain:everything",
+        "//command_line_option:cpu": "wasm",
         "//command_line_option:features": features,
         "//command_line_option:dynamic_mode": "off",
         "//command_line_option:linkopt": linkopts,
@@ -36,6 +39,9 @@ def _wasm_transition_impl(settings, attr):
 _wasm_transition = transition(
     implementation = _wasm_transition_impl,
     inputs = [
+        "//command_line_option:compiler",
+        "//command_line_option:cpu",
+        "//command_line_option:crosstool_top",
         "//command_line_option:features",
         "//command_line_option:linkopt",
     ],